| Author |
Message |
    
Noone1569
| | Posted on Sunday, August 07, 2011 - 02:03 pm: | 
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One of my buddies has an 04 XB12R that is making a terrible sound while low in the rpm range.
I've attached a video here that you can hear the noise; its almost as if it is knocking.
Noise seems to taper off as you increase RPM, sounds really bad at idle.
2004 XB12R
21xxx miles
Stock except for K&N.
Any ideals on what the noise is, causation and how to fix it?
http://s132.photobucket.com/albums/q31/noone1569/? action=view¤t=VIDEO0004.mp4 |
Natexlh1000
| | Posted on Sunday, August 07, 2011 - 02:20 pm: |
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If lucky, it's something wrong in the primary.
If not, it's bearing.
There have been a few threads on here with engines that lose the lower connecting rod bearing after about 30,000 miles.
A symptom of this is metal shavings in the oil. Stir a small strong magnet in the oil tank and see if it comes up fuzzy.
That's is a terrible sound to hear. I hope it's just some loose stuff in primary. |
Harleyelf
| | Posted on Sunday, August 07, 2011 - 03:16 pm: |
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Just a possibility - lots of other choices - but the clutch basket would sound like that if its retaining circlip had broken or popped off. The key to diagnosing this sound is that is goes away at higher rpm. If your primary chain is loose at either end (clutch or compensating sprocket), it would make that horrible noise until the torque of the engine pulled the chain tight and then it would quiet down. Change your primary oil and look closely at the oil you take out. If the chain is rubbing there will be pieces of whatever it is rubbing against in the oil. If it's plastic your adjusting shoe has separated from its mounting plate. |
Greg_e
| | Posted on Sunday, August 07, 2011 - 03:53 pm: |
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Are the plugs all covered with black? Shine a light into the hole and see if the piston is all black. |
Hughlysses
| | Posted on Sunday, August 07, 2011 - 06:23 pm: |
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It doesn't sound like a rod bearing. First thing to check would be crankshaft nut on the primary sprocket; these have been known to work loose. Torque spec was upped to ~250 ft-lbs (from previous ~210 ft-lbs) sometime around 2005. If it's loose, remove nut, clean male and female threads with brake cleaner, apply copious amounts of liquid red Locktite, and re-torque to latest torque spec. |
Noone1569
| | Posted on Sunday, August 07, 2011 - 06:35 pm: |
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Hugh:
That compensator nut was our first guess too. He actually took it into Harley to have it checked out, and they said they "checked the nut and it was good" They also said that they didn't notice the noise, lol. |
Harleyelf
| | Posted on Tuesday, August 09, 2011 - 07:26 am: |
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Did they remove the primary case and charge him for a gasket and quart of Sport trans fluid or just "voodoo diagnose" it? That would have been a great opportunity to shake the clutch basket and check for proper mounting. |
Noone1569
| | Posted on Wednesday, August 10, 2011 - 09:45 am: |
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Harley, that's correct. Charged in for gasket and oil. They also changed his oil. This was ~1000 miles ago.
What do you guys think should be the first step in diagnosing this?
A local guy recommended running some seafoam through it.
Also have seen a recommendation of draining all the oils and checking for metal shavings. |
Cringblast
| | Posted on Thursday, August 11, 2011 - 06:58 pm: |
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Check the primary chain tension.
Pretty quick and easy check per the service manual. If thats not it you can mark it off the list.
C. |
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XB12R - Engine Noise Question